I use a bubbler system for my clones and I do use Hydrogyzeme??? as part of the water treatment. I think it makes a huge difference. When I put my shoots in the water they can sit there for days without reaction. Just as soon as I put that hydrogyzeme in there the roots take hold big time. 3 days is usually enough additional time once I start to see roots forming. I continue to use the same stuff after I take them out of the bubbler. I use it for the first couple weeks of veg. It doesn't take but a couple weeks I figure to seriously root ball the plant which is what I want. After the first couple weeks the plant has more then enough roots to get a huge jump start on the rest of it's cycle. Not cheap stuff though...about $40 per liter I think.